diff --git a/rtl/objpas/classes/action.inc b/rtl/objpas/classes/action.inc
index c57b8bb32a..b795cd5c7d 100644
--- a/rtl/objpas/classes/action.inc
+++ b/rtl/objpas/classes/action.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Component Library (FCL)
     Copyright (c) 1999-2000 by the Free Pascal development team
diff --git a/rtl/objpas/classes/bits.inc b/rtl/objpas/classes/bits.inc
index 808c3c6520..e4b70404e1 100644
--- a/rtl/objpas/classes/bits.inc
+++ b/rtl/objpas/classes/bits.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Component Library (FCL)
     Copyright (c) 1999-2008 by the Free Pascal development team
diff --git a/rtl/objpas/classes/classes.inc b/rtl/objpas/classes/classes.inc
index 6983fbe12e..d2a0bb5c15 100644
--- a/rtl/objpas/classes/classes.inc
+++ b/rtl/objpas/classes/classes.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Component Library (FCL)
     Copyright (c) 1999-2000 by Michael Van Canneyt and Florian Klaempfl
diff --git a/rtl/objpas/classes/classesh.inc b/rtl/objpas/classes/classesh.inc
index d6752e9f24..6b464147f8 100644
--- a/rtl/objpas/classes/classesh.inc
+++ b/rtl/objpas/classes/classesh.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Pascal Run Time Library (rtl)
     Copyright (c) 1999-2008 by Michael Van Canneyt, Florian Klaempfl,
diff --git a/rtl/objpas/classes/collect.inc b/rtl/objpas/classes/collect.inc
index 0d59f8ccca..40aaa2b772 100644
--- a/rtl/objpas/classes/collect.inc
+++ b/rtl/objpas/classes/collect.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Component Library (FCL)
     Copyright (c) 1999-2000 by the Free Pascal development team
diff --git a/rtl/objpas/classes/compon.inc b/rtl/objpas/classes/compon.inc
index c6e83dbf88..4f31de6e83 100644
--- a/rtl/objpas/classes/compon.inc
+++ b/rtl/objpas/classes/compon.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Component Library (FCL)
     Copyright (c) 1999-2000 by the Free Pascal development team
diff --git a/rtl/objpas/classes/constsg.inc b/rtl/objpas/classes/constsg.inc
index 1a6c1194b9..e176d1fc63 100644
--- a/rtl/objpas/classes/constsg.inc
+++ b/rtl/objpas/classes/constsg.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Component Library (FCL)
     Copyright (c) 1999-2000 by the Free Pascal development team
diff --git a/rtl/objpas/classes/constss.inc b/rtl/objpas/classes/constss.inc
index f834124cd3..74d7bfe04a 100644
--- a/rtl/objpas/classes/constss.inc
+++ b/rtl/objpas/classes/constss.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Component Library (FCL)
     Copyright (c) 1999-2000 by the Free Pascal development team
diff --git a/rtl/objpas/classes/cregist.inc b/rtl/objpas/classes/cregist.inc
index 9113e6102e..975aa11da4 100644
--- a/rtl/objpas/classes/cregist.inc
+++ b/rtl/objpas/classes/cregist.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Component Library (FCL)
     Copyright (c) 1999-2000 by the Free Pascal development team
diff --git a/rtl/objpas/classes/dm.inc b/rtl/objpas/classes/dm.inc
index 9c130a0636..83ec2ee658 100644
--- a/rtl/objpas/classes/dm.inc
+++ b/rtl/objpas/classes/dm.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Pascal run time library.
     Copyright (c) 2003 by the Free Pascal development team
diff --git a/rtl/objpas/classes/filer.inc b/rtl/objpas/classes/filer.inc
index 996a2ec3a4..76074768c2 100644
--- a/rtl/objpas/classes/filer.inc
+++ b/rtl/objpas/classes/filer.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Component Library (FCL)
     Copyright (c) 1999-2000 by the Free Pascal development team
diff --git a/rtl/objpas/classes/intf.inc b/rtl/objpas/classes/intf.inc
index 9da6cc371a..7821ae88da 100644
--- a/rtl/objpas/classes/intf.inc
+++ b/rtl/objpas/classes/intf.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Component Library (FCL)
     Copyright (c) 2002 by the Free Pascal development team
diff --git a/rtl/objpas/classes/lists.inc b/rtl/objpas/classes/lists.inc
index efc78f4e22..df1c0480c4 100644
--- a/rtl/objpas/classes/lists.inc
+++ b/rtl/objpas/classes/lists.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Pascal Run Time Library (rtl)
     Copyright (c) 1999-2005 by the Free Pascal development team
diff --git a/rtl/objpas/classes/parser.inc b/rtl/objpas/classes/parser.inc
index eed58a999c..299afe750b 100644
--- a/rtl/objpas/classes/parser.inc
+++ b/rtl/objpas/classes/parser.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Component Library (FCL)
     Copyright (c) 1999-2007 by the Free Pascal development team
diff --git a/rtl/objpas/classes/persist.inc b/rtl/objpas/classes/persist.inc
index 824f823616..f6c3ed125f 100644
--- a/rtl/objpas/classes/persist.inc
+++ b/rtl/objpas/classes/persist.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Component Library (FCL)
     Copyright (c) 1999-2000 by the Free Pascal development team
diff --git a/rtl/objpas/classes/reader.inc b/rtl/objpas/classes/reader.inc
index f196674607..d47fc3b7bb 100644
--- a/rtl/objpas/classes/reader.inc
+++ b/rtl/objpas/classes/reader.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Component Library (FCL)
     Copyright (c) 1999-2000 by the Free Pascal development team
diff --git a/rtl/objpas/classes/resref.inc b/rtl/objpas/classes/resref.inc
index e0f9e01c4e..2feddb6c9f 100644
--- a/rtl/objpas/classes/resref.inc
+++ b/rtl/objpas/classes/resref.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Pascal Run Time Library (rtl)
     Copyright (c) 2007 by Michael Van Canneyt,
diff --git a/rtl/objpas/classes/sllist.inc b/rtl/objpas/classes/sllist.inc
index 7589bccff4..b9f451be70 100644
--- a/rtl/objpas/classes/sllist.inc
+++ b/rtl/objpas/classes/sllist.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Pascal Run Time Library (rtl)
     Copyright (c) 2007 by Michael Van Canneyt,
diff --git a/rtl/objpas/classes/stringl.inc b/rtl/objpas/classes/stringl.inc
index 490e7907e5..5eab23cb52 100644
--- a/rtl/objpas/classes/stringl.inc
+++ b/rtl/objpas/classes/stringl.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Component Library (FCL)
     Copyright (c) 1999-2000 by the Free Pascal development team
diff --git a/rtl/objpas/classes/twriter.inc b/rtl/objpas/classes/twriter.inc
index 20cdbb5dd4..48f34785a2 100644
--- a/rtl/objpas/classes/twriter.inc
+++ b/rtl/objpas/classes/twriter.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Component Library (FCL)
     Copyright (c) 1999-2000 by Michael Van Canneyt and Florian Klaempfl
diff --git a/rtl/objpas/classes/util.inc b/rtl/objpas/classes/util.inc
index b90d7ce9ed..45d5706a26 100644
--- a/rtl/objpas/classes/util.inc
+++ b/rtl/objpas/classes/util.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Component Library (FCL)
     Copyright (c) 1999-2000 by Michael Van Canneyt and Florian Klaempfl
diff --git a/rtl/objpas/classes/writer.inc b/rtl/objpas/classes/writer.inc
index f0df133361..aebc7c4442 100644
--- a/rtl/objpas/classes/writer.inc
+++ b/rtl/objpas/classes/writer.inc
@@ -1,3 +1,4 @@
+{%MainUnit classes.pp}
 {
     This file is part of the Free Component Library (FCL)
     Copyright (c) 1999-2000 by the Free Pascal development team